Upwork home
Sign up
Secondary
Oleksii P. Status: Offline
Vilnius, Lithuania
100% Job Success
Top Rated Plus

Swift Developer | Swift iOS developer | Mobile App Development | iOS

MIMINUM ENGAGEMENT - 1 Month MINIMUM BUDGET - $5000 Only serious projects with established companies & startups 🌟 10 years of proven mobile app expertise 🌟 As a skilled Swift Developer, I specialize in iOS development, creating innovative and high-performance iOS apps. With a strong foundation in Swift, SwiftUI, UIKit, and Objective-C, I build visually stunning and user-friendly interfaces. 🌟 I don't sell hours - I guarantee results 🌟 Successful apps released to AppStore and Google Play I'm a passionate full-stack mobile app developer with over 8 years of experience crafting high-performance iOS and Android applications. My expertise spans Swift, Objective-C, Kotlin, Flutter, and React Native, allowing me to build native and cross-platform apps that power millions of devices worldwide. As a skilled Android developer and Flutter developer, I’ve developed and optimized 50+ mobile applications, specializing in mobile app development that delivers seamless user experiences focused on speed, security, and scalability. My work with Kotlin Multiplatform has reduced development time by 40%, enabling businesses to ship faster and more efficiently. I have extensive experience in iOS development, working with Swift, Objective-C, SwiftUI, UIKit, and Apple Xcode to create smooth, high-performance applications. My attention to iOS design ensures clean UI patterns and natural navigation. On the Android side, I build native apps using Kotlin and Java, running seamlessly across devices. I also leverage React Native and Flutter to create cross-platform mobile apps, with several apps exceeding 500K+ downloads globally. On the backend, I work with Node.js and JavaScript, building scalable APIs and cloud-powered services. I also collaborate with PHP developers when needed to integrate legacy systems or manage backend CMS-driven applications. My work spans industries—from e-commerce to education. I’ve built scalable platforms including dating apps with real-time messaging and user matching, and tutoring apps with scheduling, video chat, and progress tracking, all optimized for growth and engagement. Beyond development, I specialize in mobile UI/UX design. With expertise in Material Design, widget customization, and lifecycle management, I’ve improved user engagement by 60%, delivering apps that feel natural and responsive. I’ve integrated Google Maps and MapBox for geolocation features used by millions, and implemented monetization strategies that have driven over $1M+ in app-based transactions. Using Firebase and AWS, I develop secure, real-time apps with 99.9% uptime, supporting features like push notifications, authentication, analytics, and cloud sync. Whether building AI-powered tools, IoT-connected mobile solutions, or enterprise-scale apps, I ensure performance, security, and maintainability come first. With a mobile-first mindset, I build solutions that work beautifully across iOS, Android, and the web—helping startups and enterprises scale confidently in a competitive market.
Work history
Oleksii P. has more jobs. Create an account to review them
Skills

Skills

Get started working with Oleksii quickly with these predefined projects.

Get started working with Oleksii quickly with these predefined projects.

You will get iOS | Android | Swift | Dart | Swift Native | Dating App Development

From $45
3 days delivery

You will get Swift | Mobile App iOS | Kotlin | Android | UI/UX Design

From $150
5 days delivery

You will get iOS | Android | Swift| Mobile | Dart | Hybrid | Native | Fitness App

From $50
3 days delivery

You will get iOS | Android | Swift | Dart | Kotlin | Mobile app development

From $50
3 days delivery

Browse similar freelancers